When director Alex Gibney began working on a documentary about Lance Armstrong in 2009, he thought it would be a film about the cyclist’s heroic struggle with cancer and his strength amid false doping rumors.

But when those rumors turned out to be true, the film took a different turn.

“He had lied to me, straight to my face, all throughout 2009,” the filmmaker said. “When the truth came out, I told him he owed me an explanation.”

What had begun as an inspiring comeback story became a documentary chronicling the rise and cataclysmic fall of a disgraced sports hero.

Gibney even changed the title from The Road Back to The Armstrong Lie, and a new trailer suggests the film will portray Armstrong as an arrogant athlete bent on winning at any cost.

“I like to win,” Armstrong says in the trailer. “But more than anything, I can’t stand the idea of losing, because to me that equals death.”

“I certainly was confident that I would never be caught,” he adds.

The Oscar-winning Gibney, whose directing credits include Enron: The Smartest Guy in the Room and The Rise and Fall of Eliot Spitzer, said of The Armstrong Lie,

“This is not a story, this is a story about power. And the story became [about] hanging onto that power.”